JPH0769565B2 - Camera system and lens structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera system and a positioning recess, each of which includes a camera body and a lens structure that are attachable to and detachable from each other by a positioning engagement portion, and has a positioning member on one side and a positioning recess on the other side. Regarding the lens structure.

2. Description of the Related Art In general, this type of camera system has a small attaching / detaching torque, a small attaching / detaching rotation angle, and an excellent attach / detach operability when the attaching / detaching operation is performed. According to the intention of drawing, the interchangeable lens as a lens structure can be quickly removed and a desired interchangeable lens can be attached. Using such a camera system, a user frequently exchanges interchangeable lenses suitable for various subjects and shoots.

By the way, conventionally, as a camera system, when a positioning engagement portion comes to a predetermined position in accordance with an attachment operation of a camera body and an interchangeable lens, a spring-biased positioning member protrudes into a positioning concave portion and engages with it while locking. A lens locking device that releases the engagement between the positioning member and the positioning recess in accordance with the engagement release operation by the release member
−50420.

However, in this lens lock device, when the interchangeable lens is quickly attached, the spring-biased positioning member has a slower protrusion speed than the rotation speed at which it is attached. Collides with the side surface of the positioning recess in the mounting direction. In this case, since the protrusion amount of the positioning member is smaller than the predetermined amount, the contact area at the time of the collision is reduced and the surface pressure is increased. Then, the mounting is completed while the engagement between the positioning member and the positioning recess is insufficient. If the lens is frequently exchanged in such an inadequately mated state with high surface pressure, the positioning recess on the mount surface will be gradually dented by the impact force of the high positioning pressure on the side surface in the mounting direction. It will be dented and the mount side will swell. Further, since the positioning member on the camera body side is also insufficiently engaged, the collision portion with the positioning recess is gradually dented. Therefore, the positioning member is twisted in the fitting sliding hole of the mount surface of the camera body, and the projecting action thereof is reduced. In an extreme case, the mounting may be completed without the positioning member jumping over the positioning recess and engaging. In this way, when the mounting is completed in an irregular positioning state in which the positioning recess and the positioning member are dented to increase backlash and jump over, a signal transmission member (for example, a diaphragm control member, which transmits and receives a signal between the camera body and the interchangeable lens, (Those that rotate and transmit signals, such as the diaphragm member) cannot transmit accurate information to each other, resulting in exposure errors, etc., and the contacts that electrically send and receive signals are regular contacts. Correspondingly, there is no continuity, and it becomes impossible to exchange signals, and the camera stops working. If the user takes a picture without knowing it in the above-mentioned inconvenient state, a picture with proper exposure cannot be obtained, and the optical device will be in a failure state. Further, the impact force with the positioning member may cause an accident that the mount surface of the interchangeable lens is damaged. Furthermore, in an optical device configured to perform drive transmission for focus control between the camera body and the lens structure, when the drive transmission shaft that meshes with the driven shaft is interlocked with the positioning member, meshing engagement does not occur. If the focusing switch is pressed in a sufficient state, a phenomenon such as a splashing phenomenon will occur at the meshing portion of the drive transmission shaft with a shallow engagement, and the meshing portion will be damaged.

On the other hand, in a screw mount type camera system, during the last one revolution of the interchangeable lens, the positioning member first enters into the positioning recess of the mating side to regulate the position, and the screw releasing member is released to release the screw. Even if it is inserted, it is tightened at a predetermined position, and by providing a gentle inclined surface in the screwing direction in the positioning recess, it is possible to screw it out by operating the screwing release member. This is proposed in Japanese Utility Model Publication No. 54-38911.

This camera system has a gentle slope in the direction of the removal of the positioning recess (when removing the interchangeable lens,
The slope is less than 45 °. ) Is provided, when the interchangeable lens is quickly attached, the positioning member protrudes from the gentle inclined surface, but the inclined surface is gentle, so the amount of protrusion of the positioning member in the engaging direction is small. However, the positioning member and the positioning recess are not always fully engaged with the positioning recess, and a bulge occurs in the positioning member and the positioning recess due to an impact. Further, in this case, a configuration is adopted in which drive transmission for focusing control is performed between the camera body, which is the camera body, and the interchangeable lens, which is the lens structure. Considering interlocking with the positioning member to advance and retreat for engagement and disengagement, the mount surface of the interchangeable lens is pressed against a drive transmission shaft that interlocks with the positioning member and is slid, so that it is scratched. In addition, when removing the interchangeable lens, the positioning member is pushed up to the position where the inclined surface of the positioning recess starts and disengages, and it becomes rotatable, but the drive transmission shaft is still in mesh with the driven shaft and There is a drawback that the drive transmission shaft may receive the turning force without being received by the positioning member, and the meshing portion may be damaged.

As a camera system that eliminates these drawbacks, if the engagement state of the autofocus drive shaft of the camera body and the driven shaft of the interchangeable lens is incomplete, the drive shaft or the position of the positioning member that is interlocked with the drive shaft should be set at the protruding position. According to Japanese Patent Laid-Open No. 57-173809, the switch member is opened / closed in response to this, and a warning is given by the switch member at an insufficient protruding position, or the user can be made unable to drive to prompt the user to optimize the meshing state. Have been proposed.

The device described in JP-A-57-173809 can prevent dents and inaccurate information transmission by issuing a warning or disabling driving when the positioning member is insufficiently engaged with the positioning recess. However, since a switch member is required and the switch position needs to be adjusted, the cost is increased, and the extra space is required, resulting in a large optical device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems in the prior art, and even if the camera body is quickly attached to the lens body, the camera body and the lens body Avoids damage to the attachment / detachment mechanism caused by insufficient mating (insufficient protrusion of the positioning member), signal transmission between the camera body and lens assembly, control, and drive failure. It is an object of the present invention to provide a camera system and a lens structure that can be used.

Means and Actions for Solving Problems In order to achieve the above object, the camera system of the present invention includes a camera body and a lens structure that are detachably attached by being relatively rotated about an optical axis. Alternatively, a positioning recess extending in the optical axis direction is formed on one of the lens structures, and a positioning member urged to extend in the optical axis direction is provided on the other of the camera body or the lens structure, A camera system capable of making the camera body and the lens assembly non-rotatable by fitting the positioning member into the positioning recess, wherein the positioning member has a tapered front end. A positioning member tip inclined surface inclined with respect to the relative rotation direction is provided at a tip edge portion of the positioning member, and the positioning recess is A positioning recess having a predetermined diameter larger than that of the positioning member, and having a positioning recess tip inclined surface inclined with respect to the relative rotation direction at the tip edge portion so that the tip of the positioning recess is diverged. When the relative rotation speed when the camera body and the lens structure are relatively rotated to attach the lens structure to the camera body is equal to or higher than a predetermined value, the positioning member is attached in the mounting direction of the positioning recess. The positioning member has a shape such that the positioning member enters the positioning recess by a predetermined amount of protrusion or more without contact between the positioning member distal end inclined surface and the positioning recess distal end inclined surface before colliding with the side surface. It is characterized in that the positioning member tip inclined surface and the positioning recess tip inclined surface are formed.

Further, the lens structure of the present invention has a positioning recess extending in the optical axis direction, and is provided in the camera body and extends in the optical axis direction when relatively rotated about the optical axis with respect to the camera body. Is a lens structure that makes the camera body and the lens structure relatively unrotatable by fitting a positioning member that is biased so as to fit into the positioning recess. The lens has a larger diameter and has a positioning recess tip inclined surface inclined to the relative rotation direction at the tip edge of the positioning recess so that the tip of the positioning recess widens. When the relative rotation speed of the lens structure relative to the camera body for attaching the structure to the camera body is greater than or equal to a predetermined value, the positioning unit Until the tip collides with the mounting direction side surface of the positioning recess so that the tip of the positioning member provided on the camera body is tapered with respect to the relative rotation direction of the tip edge of the positioning member. The inclined surface of the positioning concave portion is formed in such a shape that the inclined surface of the distal end of the positioning member and the inclined surface of the distal end of the positioning concave portion do not come into contact with each other and the positioning member enters the positioning concave portion by a required protrusion amount or more. It is characterized by being.

Further, the lens assembly of the present invention has a positioning recess extending in the optical axis direction, and is provided in the camera body and extends in the optical axis direction when relatively rotated about the optical axis with respect to the camera body. Is a lens structure that makes the camera body and the lens structure relatively unrotatable by fitting a positioning member that is biased so as to fit into the positioning recess. Has a larger predetermined diameter, and has an outer inclined surface and an inner inclined surface that are inclined with respect to the relative rotation direction at the tip edge portion of the positioning recess so that the tip end of the positioning recess widens. The outer inclined surface is provided closer to the tip side of the tip portion than the inner inclined surface, and the outer inclined surface has a smaller inclination angle than the inner inclined surface. When the relative rotation speed of the lens body is relatively rotated with respect to the camera body for attachment to the camera body, the positioning member collides with a side surface of the positioning recess in the mounting direction. By the time the positioning member provided on the camera body does not come into contact with either the outer inclined surface or the inner inclined surface, the positioning member enters the positioning concave portion by a predetermined amount or more. It is characterized in that the outer inclined surface and the inner inclined surface are formed in a shape.

Therefore, according to the camera system and the lens structure of the present invention, when the relative rotation speed of the camera body and the lens structure is relatively rotated to attach the lens structure to the camera body, the relative rotation speed is not less than a predetermined value. In addition, the positioning member can be advanced into the positioning recess by a predetermined amount or more before the positioning member collides with the mounting recess side surface of the positioning recess.

Embodiment Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment.

In FIGS. 1 and 2, 1 is an interchangeable lens as a lens structure, 2 is a camera body as a camera body on which the interchangeable lens 1 is rotated and attached, and 4 is formed on a mount surface 3 b of the interchangeable lens 1. The driven shaft 5 disposed in the driven shaft recess 3d is a lens drive shaft which can be retracted from the predetermined position of the mount surface 3a of the camera body 2 in the optical axis direction, and can be disengaged from the driven shaft 4, and 6 is the lens drive shaft. A positioning concave portion 7 formed on the mount surface 3b of the interchangeable lens 1 is a positioning member that can be retracted from the predetermined position of the mount surface 3a of the camera body 2 in the optical axis direction to be engaged with and disengaged from the positioning concave portion 6.

In order to release the engagement of the lens drive shaft 5 and the positioning member 7 with the driven shaft 4 and the positioning recess 6 by an external operation, a lock releasing member 8 is provided, and the positioning member is accompanied by the engagement releasing operation by the lock releasing member 8. The retracting operation of 7 and the retracting operation of the lens drive shaft 5 are linked by a linking member 9 shown in FIGS. The unlocking member 8
Is inserted into a guide shaft 10 arranged at a predetermined position in the camera body 2 near the mount surface 3a, as shown in FIG.
The front cover 11 of the camera body 2 can be moved back and forth toward the outside of the device, while the rear surface of the lock release member 8 is used to mount
A connecting plate 12 extending to the back of 3a is fixedly provided.

The positioning member 7 is pierced through the camera body 2 and the camera body fixing member 13b to be axially supported, and further inserted into the hole of the connecting plate 12, and the connecting plate 12 is applied to the flange portion 7b formed on the rear end peripheral surface thereof. , Is moved to the right in FIG. 4 by the connecting plate 12 in accordance with the engagement releasing operation by the lock releasing member 8,
The mounting surface 3b of the interchangeable lens 1 is disengaged from the positioning recess 6. On the other hand, the positioning member 7
The coil spring 14 is contracted between the flange portion 7a formed on the peripheral surface of the body of the camera body and the camera body fixing member 13b, and the positioning member 7 is urged toward the front surface of the camera body 2 so that the interchangeable lens 1 With the mounting operation, the positioning recess 6 of the mount surface 3b of the interchangeable lens 1 is engaged.

The linking member 9 is, as shown in FIGS. 3 and 5,
One end of the coil spring 18 is pivotally attached to the camera body 2 via the rotary shaft 15, while the guide hole 16 of the other end is fitted and inserted into the guide shaft 17 of the camera body fixing member 13b. By the action, the camera body 2 is biased to the front side so that the camera body 2 can be swung in the front-back direction (the same direction as the optical axis). A U-shaped fork portion 19 is formed at the other end of the linking member 9, and the fork portion 19 is fitted onto the circumferential groove 5a of the lens drive shaft 5 while the fork portion 19 and the pivot end portion are Form a semi-circular protrusion 20 protruding to the front side of the camera body in the middle,
Engaging flange portion 7a formed on the peripheral surface of the body of the positioning member 7
The semi-circular protrusion 20 is applied to the back surface of the camera body, and the linking member 9 rotates toward the rear side of the camera body against the biasing force of the coil spring 18 as the positioning member 7 retracts. The lens drive shaft 5 that engages with the portion 19 can be moved to the rear side of the camera body.

The lens drive shaft 5 has its rear end portion pierced through the camera body fixing member 13b to be axially supported, and is slightly swung with respect to the inner diameter of the through hole 3c of the mount surface 3a, that is, has a clearance (gap) C. On the other hand, a focus control device mounted in the camera body 2 by fixing a driven gear 22 that meshes with a drive gear 21 axially supported on the back side of the camera body fixing member 13b at the rear end of the lens drive shaft 5 The rotation of a motor (not shown) driven and controlled by the above is transmitted to the drive gear 21 through an arbitrary transmission system, and then the rotation of the drive gear 21 is transmitted from the driven gear 22 to the lens drive shaft 5.

A state in which the positioning member 7 projects into the positioning recess 6 when the interchangeable lens 1 is attached to the camera body 2 will be described with reference to FIGS. 6 (a), (b), (c) and (d).

Along with the mounting operation of the interchangeable lens 1, the coil spring 14
The urging force of the positioning member 7 starts to project from the mount surface 3a of the camera body 2 into the positioning recess 6 formed in the mount surface 3b of the interchangeable lens 1, but the mass of the positioning member 7 is m and the coil spring 14 Is the spring constant of the positioning member 7, the initial spring force of the positioning member 7 is a, the friction coefficient of the positioning member 7 with respect to the projection is μ, the projection amount of the positioning member 7 into the positioning recess 6, that is, the projection start position in the projection direction. When the protrusion amount is y and the elapsed time after the protrusion of the positioning member 7 is t, the protrusion amount y is Becomes

The equation (1) is derived as follows. That is,
The dynamic model of the positioning member 7 and the coil spring 14 is as shown in FIG. 6 (a). When F is the spring force of the coil spring 14, the force F ₁ actually acting on the positioning member 7 is F ₁ . ₁ = F (1-μ) ・ ・ ・ (2) However, in this case, the braking force μ is assumed to be zero at the position of F = 0 (when the coil spring 14 extends to the free length), and the braking force is actually generated at this position. Then, the coil spring 14 is not operated to this position, and the operation is performed in a region where the coil spring 14 can perform a sufficient operation, that is, a region where the free length is not obtained.

Further, since F is the force of the coil spring 14 itself, F = a-ky (3) Further, due to the force F ₁ acting on the positioning member 7, the operation equation is Is represented.

From the equations (2), (3) and (4), if F and F ₁ are eliminated, Becomes Here, in order to simplify the equation, if coordinate axis conversion is performed as follows, (1-μ) (a-ky) =-KX (6) By substituting equations (6) and (7) into equation (5), Is obtained. Since this is the so-called second-order ordinary differential equation, Therefore, when converted to the original y coordinate system, Is obtained.

Where C ₁ and C ₂ are constants, Then, C ₁ = 0, C ₂ = a / k, and the equation (9) is the above equation. Becomes The equation (1) is an equation of motion of the positioning member 7 with the protrusion start position being zero.

In addition, the formula (1) is obviously a simple vibration formula, and an operation originally involving friction should be a damped vibration due to energy loss. This difference is due to the assumption that F ₁ = F (1-μ) at first, and more strictly, the damping term should be applied to the head part of equation (10). However, in this study, since only the initial operation of the damped vibration is dealt with as described above, the difference is small and not a problem. Also, this approximation does not hinder the practical purpose, and more rigorous handling is possible if necessary.

Projection amount y of the positioning member 7 represented by the above formula (1)
And the elapsed time t when the user mounts the interchangeable lens 1 at a quick speed, as shown by the protrusion line A in FIG. 6 (b), and the protrusion amount per unit time is small in the initial stage.
The amount of protrusion increases with time.

Therefore, the present inventor has discovered that if the shape of the positioning recess 6 is set so as not to interfere with the protruding line A, the protruding amount y of the positioning member 7 increases. The details will be described below.

Now, the shape of the surface of the positioning recess 6 in the mounting direction of the interchangeable lens 1 is shown in FIG. 6 (b) in relation to the elapsed time t.
Consider what is represented by the shape lines B and B'in (c). Sixth
In the figure (b), the shape line B of the positioning recess 6 is the positioning member 7.
6C shows the case where the shape line B ′ is partially on the right side of the projecting line A, and tΔ in each graph indicates that the positioning member 7 is the positioning recess 6
Represents the elapsed time converted from the mounting speed of the interchangeable lens 1 for the clearance Δ in the state of being engaged with.

Figure 6 (c), the positioning member 7 is beginning to protrude from the mounting face 3b of the interchangeable lens 1, the projection amount y at time t _1
t1 and intersects with the shape line B ′ of the positioning recess 6 (the positioning member 7 collides with the positioning recess 6) there, and from the time t ₁ it reaches the one side surface 6d of the positioning recess 6 and the clearance Δ. The protrusion amount y _t2- y _t1 is obtained up to a time t ₂ when the positioning concave portion 6 collides with the other side surface 6e shown in FIG. 7 after a corresponding time tΔ has elapsed. That is, the positioning member 7 begins to protrude from the mount surface 3b of the interchangeable lens 1,
The amount of protrusion y after the collision with the other surface 6e of the positioning recess 6 until the completion of mounting is y _t2 . When the shape line B'of the positioning recess 6 is on the right side of the projecting line A of the positioning member 7 in FIG. 6 as described above, the positioning member 7 collides with the slope of the positioning recess 6 on the way to the projection and there Further, since the initial protrusion amount is a curve with a small protrusion amount, the overall protrusion amount is small.

On the other hand, in FIG. 6 (b), the positioning member 7 is
Although it protrudes along a protrusion line A similar to that in FIG. 6C, it begins to protrude from the mount surface 3b of the interchangeable lens 1 and then to the other surface side 6e of the positioning recess 6 after a time tΔ similar to that in FIG. 6C has elapsed. The amount of protrusion y is the time t ′ ₁ from collision to completion of mounting.
In this case, the positioning member 7 projects without colliding with the positioning recess 6 on the way of projecting, and the projecting amount per hour is small in the initial stage of the projecting line A, but the projecting amount is reduced with the passage of time. By making use of the characteristic of being increased, the protrusion amount becomes larger than that in FIG. 6C, and the protrusion of the positioning member makes it possible to obtain the required protrusion amount for positioning which enables sufficient positioning.

In FIG. 6B, the surface shape of the positioning recess 6 of the interchangeable lens 1 is schematically drawn. Actually, as an example,
As shown in the figure, the positioning recessed portion 6 has a circular arc portion 6a, inclined portions 6b and 6c of 60 ° or more, and an engaging portion 6d, which is one side surface, continuously arranged from the mounting surface 3b, while the mounting surface 3b is provided on the other side surface. When a certain engaging portion 6e is provided and the engaging portion is constituted by the engaging portions 6d, 6e and the positioning member 7, its shape line is left from the projecting line on the left side on the graph in FIG. 6 (b) for quick mounting operation. It has been confirmed by experiments that good results are obtained. The arc portion 6a and the inclined portions 6b and 6c are non-contact portions. With respect to the mount surface 3b, that is, the relative movement direction of the interchangeable lens 1,
The arc portion 6a has a small gradient, and the inclined portions 6b and 6c have a large gradient. 7 (a) to 7 (d), the positioning member 7 of the camera body 2 is projected from the mount surface 3b of the interchangeable lens 1 by the quick mounting operation of the interchangeable lens 1,
FIG. 7 is an explanatory diagram showing how the positioning recesses 6 are engaged. The positioning member 7 is the interchangeable lens 1 in FIG.
When the interchangeable lens 1 is rotated in the direction of the arrow (a) from the mount surface 3b of FIG. 7 by the urging force of the coil spring 14, the protrusion starts as shown in FIG. The arc portion 6a and the inclined portions 6b, 6c project without colliding. Further, in FIG. 7 (c), the positioning member 7 that has passed without colliding with the inclined portion 6c projects toward the engaging portions 6d and 6e, but there is a positioning recess 6 and a clearance Δ, and the amount of protrusion between them is It is larger than the initial amount, and when it collides with the engaging portion 6e as shown in FIG. 7 (d), the predetermined protrusion amount has already been reached.

When the user performs the mounting operation of the interchangeable lens 1 slowly or slightly quickly, the positioning member 7 starts to project from the mount surface 3b by the biasing force of the coil spring 14, but
Since the shape line B in FIG. 6 (d) in which the abscissa represents the elapsed time of the arc portion 6a and the inclined portions 6b, 6c in the figure is gentler than the protruding line A of the positioning member 7, the arc portions 6a, 60 The positioning member 7 protrudes while contacting the inclined portions 6b and 6c at an angle of 0 ° or more, and when reaching the intersection of the inclined portion 6c and the engaging portion 6d, the positioning member 7 is separated from that point and protrudes based on the protruding line A of the positioning member 7. At this time, since the mounting speed is not extremely fast, the positioning member 7
The time tΔ for moving by the clearance Δ with respect to the positioning recess 6 is relatively long as shown in FIG. 6 (d),
The positioning member 7 has a margin to project, and reaches a predetermined projecting amount y ₁ when colliding with another engaging portion 6e.

FIGS. 8 (a) to 8 (d) show an embodiment, and similarly to FIG. 7, the positioning member 7'protrudes from the mount surface 3'b of the interchangeable lens 1 ', and becomes a positioning recess 6'. It is an explanatory view of a state of engaging. 7 (a), (b),
The difference from (c) and (d) is that the positioning recess 6'is provided with an inclined portion 6'a and an engaging portion 6'b which are 60 ° or more from the mount surface 3'b, and the positioning member 7'is provided. , Arcuate portion 6a and inclined portion provided in the positioning recess 6 of the first embodiment
6b or 6c from the flat tip to the circular arc 7'c, 60
It is being replaced by an inclined portion 7'd having a degree of more than 0 ° and is continuously provided. Since the shape lines of the positioning recess 6'and the positioning member 7'by the quick mounting operation of the interchangeable lens 1'are combined into the same shape line as the positioning recess 6 of the first embodiment,
Similar to the engagement procedure of FIGS. 7 (a), (b), (c), and (d), the positioning member 7'provides the eighth movement when the interchangeable lens 1'is rapidly pivoted in the arrow direction. Figures (a), (b),
As shown in (c), the inclined portion 6'a, the tip side portion 7'c, and the inclined portion 7'd project without colliding with each other, and reach the clearance Δ with the positioning recess 6 ', and as shown in FIG. 8 (d). Thus, the predetermined amount of protrusion is reached and the collision with the engaging portion 6'c occurs.

Even if the user slowly or slightly mounts the interchangeable lens 1 ', the arcuate portion 7'c of the positioning member 7'is the inclined portion 6'a of the positioning recess 6', as in the first embodiment. It projects while contacting with, and reaches a predetermined amount of projection and collides with the engaging portion 6'c in a period corresponding to the clearance Δ with the positioning recess 6 '.

FIG. 9 shows another embodiment of the present invention, in which an inclined portion 6 "a is provided around the positioning recess 6" to facilitate grooving (for example, countersinking), and otherwise the second embodiment. It has the same configuration as the embodiment. Whether the interchangeable lens 11 ″ is installed quickly or slowly, the positioning member 7 ″ is sufficiently projected into the positioning recess 6 ″ without any change from FIG. 8. As shown in FIG. Even in the attaching / detaching device having the lens drive shaft 5 that is engaged with the driven shaft 4 in conjunction with the member 7, the positioning member 7 surely causes the positioning concave portion 6 to project a predetermined amount even by a quick mounting operation. In reference numeral 5, the linking member 9 is rotated toward the interchangeable lens by the urging force of the coil spring 18, and along with this rotation, it is moved in the direction of the driven shaft 4 and securely engaged with the driven shaft 4. The interchangeable lens 1 is removed. In this case, the lock release member 8 shown in FIGS.
In accordance with the engagement release operation by the, the positioning member 7 is removed from the positioning recess 6 against the biasing force of the coil spring 14, and retracted from the mount surface 3b to the camera body 2 side, and the lens drive shaft 5
The linking member 9 linked to the positioning member 7 releases the engagement with the driven shaft 4, retracts from the mount surface 3b to the camera body 2 side, and is automatically removable. If the rotational release is performed while the engagement releasing operation of the lock releasing member 8 is not completed, the circular arc portion 6a and the inclined portions 6b and 6c formed in the positioning recess 6 and the positioning member 7 shown in FIG. Of the lens drive shaft 5 because the permissible clearance (runout) C shown in FIG. 5 is larger than {rotational direction length l + clearance Δ + tolerance}. Does not come into contact with the inner diameter of the through hole 3c of the mount surface 3b and does not receive a turning force. Therefore, the drive shaft 5 can be prevented from being damaged.

10 and 11 show a fourth embodiment, which is a positioning recess 36 in the radial direction on the bayonet claw 31 of the interchangeable lens 1.
Is provided, and the tip of a positioning lever 37 as a positioning member is engaged with the positioning recess 36. The positioning lever is swingably supported by a fixing pin 38 provided on a camera body (not shown) and is biased by a spring 39. The positioning recess 36 is provided with an arc portion 6a and inclined portions 6b and 6c similar to those in the first embodiment. In this embodiment, the positioning lever 37 is not interlocked with the drive shaft (not shown), but can be interlocked.

The applicable optical devices are not limited to those in which the camera body in each of the above-described embodiments is used as the camera body and the interchangeable lens is used as the lens structure, and an intermediate ring, a rear conversion lens, or the like that is a counterpart device of the camera body is also used. It is also effective to use a lens structure. Further, the present invention can be applied not only to a single-lens reflex camera, but also to an interchangeable lens range finder camera, a video camera, etc., and is also effective for a processor and an enlarger.

EFFECTS OF THE INVENTION As is clear from the above description, the scope of claims,
In the second item, the positioning member has a tip end inclined surface which is formed at the tip edge of the positioning member so that the tip end of the positioning member is tapered, and is inclined with respect to the relative rotation direction of the camera body and the lens structure. The recess has a predetermined diameter larger than that of the positioning member, and the positioning recess tip inclined surface that is formed at the tip edge of the positioning recess so that the tip of the positioning recess is divergent, and is inclined with respect to the relative rotation direction is When the relative rotation speed when the camera body and the lens structure are relatively rotated to attach the lens structure to the camera body is equal to or higher than a predetermined value, the positioning member has a side surface in the mounting direction of the positioning recess. While the positioning member tip inclined surface and the positioning recess tip inclined surface do not come into contact with each other before colliding with the Are those shaped to enter main positioning protrusion amount or more to.

Therefore, according to the camera system and the lens structure of the present invention, when the camera body and the lens structure are rapidly rotated relative to each other around the optical axis, the positioning member tip inclined surface that tapers the tip end of the positioning member, The positioning member can be pushed into the positioning recess more than the required positioning protrusion amount without making contact with the tip of the positioning recess that makes the tip of the positioning recess wider.

Further, in the third aspect of the invention, the positioning recess has a larger diameter than the positioning member by a predetermined diameter, and the positioning recess is formed at the tip edge of the positioning recess such that the tip of the positioning recess widens. It has an outer sloping surface and an inner sloping surface inclined with respect to the moving direction, the outer sloping surface is provided closer to the tip end side of the tip portion than the inner sloping surface, and the outer sloping surface is further than the inner sloping surface. The inclination angle is small.

Therefore, when the relative rotation speed when the lens structure is rotated relative to the camera body in order to attach the lens structure to the camera body is equal to or higher than a predetermined value, the positioning member provided on the camera body is The positioning member can be pushed into the positioning recess more than the required projection amount without touching either the outer inclined surface or the inner inclined surface until it collides with the side surface of the positioning recess in the mounting direction.

As described above, according to the above-described inventions, even if the lens body is quickly mounted on the camera body, the camera body and the lens body can be reliably fitted to each other. Therefore, it is possible to prevent the contact area between the positioning member and the positioning recess from becoming insufficient due to insufficient fitting (insufficient protrusion of the positioning member). Therefore, the contact surface pressure between the positioning member and the positioning recess does not become excessive. Therefore, it is possible to avoid damage to the attachment / detachment mechanism caused by excessive contact surface pressure, and troubles and failures in signal transmission, control, and driving between the camera body and the lens structure.

That is, according to the camera system and the lens assembly of the present invention, the positioning member obtains a predetermined amount of protrusion into the positioning recess and can be securely fitted, and therefore the camera body and the lens assembly are frequently detached and engaged. However, there is no irregular positioning such as indentation of the positioning member and positioning recess, increased play due to bulge, and jumping over the positioning recess.For example, in the case of a camera, improper exposure, incorrect signal transfer, etc. Can be prevented.

Further, when the drive transmission is performed between the camera body and the lens structure, even if the lens structure is quickly moved and mounted on the camera body, the positioning member does not enter the positioning concave portion more than the required positioning protrusion amount. Since they are fitted together, it is possible to prevent damage to the meshing portion, failure of the transmission system, and the like, and it is not necessary to give a warning or disable driving, and it is possible to avoid high cost and increase in size of the device.

Further, if the inclined portion is provided around the positioning concave portion, its processing is easy, and it is possible to avoid a problem that leads to damage of the mount surface even if quick mounting is frequently performed.

[Brief description of drawings]

FIG. 1 is a front view of a camera body according to an embodiment of the present invention, FIG. 2 is a rear view of an interchangeable lens attached to and detached from the camera body, FIG. 3 is a front view of essential parts of the camera body, and FIG. FIG. 5 is a cross-sectional view of the main part of the main body, FIG. 5 is a cross-sectional view of the main part showing a state in which an interchangeable lens is attached to the camera main body, and FIG. 6A is a view for explaining the projecting operation of the positioning member. (B),
(C) and (d) are graphs showing the protruding state of the positioning member, and FIGS. 7 (a), (b), (c), and (d) are explanatory diagrams showing the engagement procedure of the positioning member, and FIG. (A), (b),
FIGS. 9 (c) and 9 (d) are explanatory views showing the engagement procedure of the positioning member of the embodiment of the present invention, and FIG. 9 is a sectional view of the essential parts showing the engagement state of the positioning member of the other embodiment of the present invention, FIG. 10 is a perspective view of a fourth embodiment of the present invention, and FIG. 11 is an enlarged view of the essential parts of FIG. 1,1 ′, 1 ″… Interchangeable lens, 2,2 ′, 2 ″… Camera body, 3a,
3'a, 3 "a, 3b, 3'b, 3" b ... mounting surface, 4 ... driven shaft,
5 ... Lens drive shaft, 6, 6 ', 6 "positioning recess, 6a, 7'c,
7 "c ... Arc section, 6b, 6'a, 6" a, 6c, 7'd, 7 "d ... Sloping section, 6d, 6e, 6'b, 6'c, 6" b, 6 "c ... Engagement part, 7,7 ', 7 "
... Positioning member, 8 ... Lock release member, 14 ... Coil spring.

Claims (3)

[Claims] 1. A camera body and a lens assembly which are detachable by being relatively rotated about an optical axis, and a positioning recess extending in the optical axis direction is formed in one of the camera body and the lens assembly. A positioning member biased so as to extend in the optical axis direction is provided on the other of the camera body and the lens assembly, and the camera body and the lens assembly are fitted by fitting the positioning member into the positioning recess. Is a camera system capable of making relative rotation impossible with respect to each other, wherein the positioning member is inclined with respect to the relative rotation direction at a tip edge portion of the positioning member such that a tip portion of the positioning member is tapered. And the positioning recess has a larger diameter than the positioning member by a predetermined diameter. The tip edge portion has a positioning recessed tip end inclined surface that is inclined with respect to the direction of the relative rotation so as to be divergent, and the camera body and the lens assembly are relatively rotated to attach the lens assembly to the camera body. When the relative rotation speed when moving is equal to or more than a predetermined value, the tip of the positioning member and the tip of the positioning recess are inclined until the positioning member collides with the side surface of the positioning recess in the mounting direction. The positioning member distal end inclined surface and the positioning recess distal end inclined surface are formed in a shape such that the positioning member enters the positioning concave portion by a required protrusion amount or more without coming into contact with each other. Characteristic camera system. 2. A positioning recess, which extends in the optical axis direction, is provided so as to be provided in the camera body and extend in the optical axis direction when relatively rotated about the optical axis with respect to the camera body. A lens structure for making the camera body and the lens structure non-rotatable by fitting a biased positioning member into the positioning recess, wherein the positioning recess has a larger diameter than the positioning member. The positioning recess has an inclined surface at the tip of the positioning recess that is inclined with respect to the direction of the relative rotation so that the tip of the positioning recess widens. The positioning member positions the positioning member when the relative rotation speed of the lens assembly relative to the camera body for attachment to the body is equal to or greater than a predetermined value. The tip edge of the positioning member provided on the camera body is inclined with respect to the relative rotation direction so that the tip of the positioning member is tapered until it collides with the side surface in the mounting direction. The sloping surface of the positioning recess is formed in such a shape that the sloping surface of the positioning member and the sloping surface of the sloping positioning recess do not come into contact with each other, and the positioning member enters the positioning recess by a predetermined protrusion amount or more. A lens structure characterized by that. 3. A positioning recess, which extends in the optical axis direction, is provided on the camera body so as to extend in the optical axis direction when relatively rotated about the optical axis with respect to the camera body. A lens structure for making the camera body and the lens structure non-rotatable by fitting a biased positioning member into the positioning recess, wherein the positioning recess has a larger diameter than the positioning member. An outer inclined surface and an inner inclined surface that are inclined with respect to the relative rotation direction at the tip edge of the positioning recess so that the tip of the positioning recess is diverged. Is provided closer to the tip side of the tip than the inner inclined surface, and the outer inclined surface is formed to have a smaller inclination angle than the inner inclined surface. The lens structure is attached to the camera body. When the relative rotation speed when the lens structure is relatively rotated with respect to the camera body is equal to or higher than a predetermined value, until the positioning member collides with the mounting direction side surface of the positioning recess. The positioning member provided on the camera body has a shape that allows the positioning member to enter the positioning recess by a predetermined protrusion amount or more without contacting either the outer inclined surface or the inner inclined surface. A lens structure, wherein an inclined surface and the inner inclined surface are formed.